Automatic elevator-gate



(No Model. 2 Sheets-Sheet 2 CLACKERMANN. Automatic Elevator Gates. No. 231,388.

Patented Aug. 24,1880.

Inventor.

UNITED STATES GEORGE AGKERMANN, OF CINCINNATI, OHIO.

AUTOMATIC ELEVATOFl-GATE.

SPECIFICATION forming part of Letters Patent No. 231,388, dated August 24., 1880.

(No model.)

To all whom it may concern:

Be it known that I, Gnonen AOKERMANN, a citizen of the United States, residing at Oin cinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Automatic Elevator- Gates, of which the following is a specification.

My invention is in the nature of an improvement upon a certain automatic elevator-gate for which Letters Patent were granted me July 27, 1880, and has for its object the arrangement of a vibratinglever, in combination with the reciprocating rack and the double-inclined plane, in such a manner that very much less power will be required to operate the gate than was necessary with my former devices for this purpose; and it consists in mounting upon a bracket secured to one of the side rails of the elevator a vibrating lever, one end of which is pivoted to the bracket, and the other end carries a stud and friction -roller, against which the double inclined plane impinges while opening and closing the gate.

To the side of the reciprocating rack, near the end next to the vibrating lever, I attach a stud, which passes through a suitablyslotted opening in the vibrating lever. Motion is given to the end of the vibrating lever carrying the friction-roller by means of the doubleinclined plane on the cage or platform of the elevator, and the motion of the lever is in turn transmitted to the sheave for lifting the gate by means of the stud on the reciprocating rack and the slotted opening in the vibrating lever.

In my former machine, as described in the Letters Patent referred to, the rack, by means of a friction-roller, impinged directly upon the working-surfaces of the do uble-inclined plane, and considerable power was required to work the rack and lift the gate, and as a consequence the working parts of the device were very heavy, and the working of it caused objectionable friction, which I now seek to avoid.

In the accompanying drawings, Figure 1 is a side elevation of an elevator, showing the cage or platform with the double-inclined plane and the manner in which I use the vibrating lever. Fig. 2 is a detached view of the vibrating lever, double-inclined plane, and reciprocating rack. Fig. 3 is a front elevation of an elevator with my improved device and Fi 4 is a detached view of the vibrating lever, friction-roller, and supporting-bracket.

Similar letters of reference indicate corresponding parts.

A represents the platform of an ordinary elevator, having side posts, B B, and crossbeams G, to which the lifting-rope D is attached. Upon the front side of one of the posts B, I secure a double-inclined plane, E, the whole of which is preferably made of metal in the form of a light open truss; or it may be made of wood and the inclined faces covered with iron rails.

F is a vibrating lever, of iron, pivoted at the lower end to the bracket f, and furnished at the upper end with a friction-roller, Gr, revolving on the stud g.

H is a toothed rack, engaging with the pinion I, and giving motion to the sheave J, which is mounted in suitable bearings 011 a frame, N. The rack H travels in horizontal ways, and is furnished atits forward end with a stud, h, which passes'through the slotted opening f, Fig. 4, in the vibrating lever F, whence any motion of the lever F inward or outward produces a corresponding travel of the reciprocating rack H.

L is a gate, of wood or iron, fitted to travel freely up and down in ways R R in front of the. hatchway.

K is a rope, firmly secured at one end to the gate L, and, by means of suitable guide-pulleys, conveyed to the grooved sheave J, where the opposite end is securely fastened.

The natural position of the vibrating lever F is with the upper end thrown inward to the side rails, S, of the elevator, the friction-roller G being then in such a position that directly the inclined plane, which moves up and down with the platform of the elevator, approaches it the vibrating lever F is forced out by either the upper or lower half of the double-inclined plane E, thus pressing the reciprocating rack H back and revolving the pinion I and sheave J in the direction necessary to wind the rope K on the sheave and lift the gate L.

The operation of the vibrating lever F is precisely the same, whether actuated by the upper or lower half of the donllleintrlined plane.

Directly the apex or center of the double- 5 inclined plane has passed above or below the friction-roller G the unbalanced weight of the gate L, acting through the rope K, sheave J, g pinion I, and rack ll, forces the roller (11 inward on the retreating surface of the inclined plane, so that when the point of the inclined plane has passed the friction-roller G the gate Lis closed. The weight 0, acting through the rope P, serves to partially balance the weight of the gate L, only so much of the weight of the gate being unbalanced as may be necessary to insure its prompt downward action.

name to the foregoing specification in the presence of two subscribing witnesses.

GEORGE AOKERMANN.

Witnesses:

(OLLIN Form, Jr., EDGAR J. (moss. 

